public class maths {
int a=1; //tutaj cos dopisane
	static int factorial(int n){
		int current=1;
		for(int i=n; i>0;i--) current*=i;
		return current;
	}
	
	static int current_sum=0;
	
	static void add(int liczba){
		System.out.println("kupa");
		current_sum+=liczba;
		System.out.println("pierdola");
	}
	
	public static int sum_return(){
		return current_sum;
	}
}
